What is a session in ASP.NET? Different ways to maintain session?

The most common used object, due to its usefulness is the Session object, and hence, it is a must-know in any interview related to ASP NET or web based programming.
Session - The session object is used to store the data specific to a user for the entire length of a user's visit to a website. Below is a code that shows usage of the session object in ASP.NET ...

//InitialPage.aspx stores the user’s credentials in Session state
Session("UserName") = txtUserName.Text;
Server.Transfer("DestinationPage.aspx");

//DestinationPage.aspx gets the user’s name from Session state
String sString = Session("UserName").ToString();

For more details on session, Click Here.